若2x-3y=0 (x不等于0) 试求(x-y)分之(x+y)的值

问题描述:

若2x-3y=0 (x不等于0) 试求(x-y)分之(x+y)的值

因为2x-3y=0,所以x=2/3y,所以(x+y)=(2/3y-y),(x-y)=(2/3y+y) 所以(x+y)/(x-y)=(2/3y-y)/(2/3y+y) =1/5 =0.2